Multiple fuse plug



July 2,1935. M. LEFEBRE l 2,006,837-

MULT I PLE FUS E PLUG Filed Deo. 19, 1933 lNvENToR Mavfz 'c lefere.

' ATTORNEY Patented July 2, 1935 l I UNITED STATES PATENT OFFICE MULTIPLE FUSE PLUG Maurice Lefebre, Detroit,y Mich. Application December 19, 1933, Serial No. 703,089

2 claims. (C1. zoo-125) This invention relates to multiple fuse plugs a series of wedge shaped raised portions Il which and the object of the invention is to provide a form radial grooves between the wedge shaped multiple fuse plug so arranged that in case a portions into which the ends I2 of the fuse ele- !use is blown the device may be re-set to bring ment may be positioned. This fuse element, as 5 another fuse into the circuit. shown in Fig. 5, comprises a central portion I3 o Another object of the invention is to provide and a series of radially extending portions I2 a multiple fuse plug comprising a plug memand the fuse elements are each provided with ber and a cap member, the cap member being a narrow portion I4 between the ends I2 and detachable from the plug member and turnable the central portion I3. 'This portion I4 pro-f' I- to different positions to bring different fuses vides the fuses which may have any desired 10'I into the circuit. capacity. This fuse element is positioned in the A further object of the invention is to provide cap I0, as shown in Fig. 3, with the central por-` a. multiple fuse plug having a series of fuse tion I3 of the fuse element positioned in the. elements, the fuse elements being stamped from central recess of the cap and with the radially l5 one piece of sheet metal with the diierent memextending ends I2 extending through the grooves l5 bers extending radially from the central portion between 'the raised portions I I. The raised porthereof. tions II are circular in general outline and are Another object of the invention is to provide arranged to t within the peripheral flange I5 .a multiple fuse plug adapted to be threaded into which provides a shallow recess at the top of l0 a socket and arranged so that the device may the fuse plug. 20 be set to bring different fuse elements into the A spring I6 is positioned within the recess in circuit without the necessity of removing the the plug I and this spring, at the lower end, fuse plug from the socket. engages a collar on the contact screw 5 so as 'I'hese objects and the several novel features to makev electrical contact therewith and this l5 of the invention are hereinafter more fully despring at the upper end engages a washer II and 25 scribed and claimed and the preferred form of tends to forcethe same into contact with the construction by which these objects are attained central portion I3 of the fuse to make electrical is shown in the accompanying drawing in contact therewith. -When the device is assemwhichbled, the cap I0 is positioned over the contact Fig. 1 is an elevation of a multiple fuse plug screw 5 with the fuse element I2a engaging the 30 embodying my invention. contact 4 of the outer threaded casing 2, as Fig. 2 is an enlarged section taken on line 2 2 will be understood from Figs. 2, 3 and 4. The of Fig. 1. plug is also provided with a raised rib member Fig. 3 is a section taken on line 3 3 of Fig. 2. I8 which engages in the groove I9 0f the Cap B5 Fig. 4 is a section taken on line 4 4 of Fig. 2. which is diametrically opposite the fuse element 35 Fig. 5 is a plan view of the one piece multiple |20" With this rib I8 engaged in the groove i9,

fuse element. it is impossible to turn the cap in relation to the Fig. 6 is an enlarged plan view of the multiple fuse plug and insures the fuse element being fuse plug. held in proper position in respect to the contact lo As shown more particularly in Fig. 1, the fuse 4. A nut member 20 of insulating material is 40 plug I is formed from insulating material such then threaded onto the upper end 0f the COIltaCt as glass, hard rubber or other suitable material. Screw 5 and aS it iS turned dOWn, it insures A threaded sheet metal casing 2 is, mounted on proper contact between the fuse element I2 and the plug I and a lead 3 extends from the memthe Contact 4. ber 2 to a contact 4 provided in a shallow circu- At this time, the fuse plug may be threaded 45 lar recess formed in the top of the plug. A coninto a socket. The current will then ow from tact screw 5 is provided, having ribs 6 fitting the threaded casing 2 of the fuse plug through in slots 1 in the plug I and this screw is provided the lead 3 to the contact 4 and thence through with a semi-spherical head 8 which forms the the fuse element I2a and through the narrow contact for the bottom of the socket. The conportion I4 of the fuse element to the central 50 tact screw 5 extends upwardly through the plug portion I3 thereof from which point, the curand through a recess shown in Fig. 2 and the rent may flow directly to the contact screw 5 upper end is arranged to extend through a cenor through the washer I1 and spring I6 to the tral aperture in a cap I0. The inner face of this screw 5 thus completing the circuit. Should cap is provided with a central recess and with the fuse blow out, it is only necessary to unthread the nut member 20 from the end of the screw 5 to allow the cap to be lifted and indexed one-eighth of a turn to bring the next fuse element into position for use, at which time, the nut 20 may be again tightened to insure proper electrical contact between the parts and to lock the cap on the rib I8 to prevent its turning. If desired, the cap I0 and nut member 20 may be made of glass so that it will be easy to see whether the fuse is blown or not.

From the foregoing description, it becomes evident that the device is very simple and erlicient in operation, will not easily get out of order, is composed of few parts and is of consequent low manufacturing cost and lll'rovides'afy device which accomplishes the objects described.

Having thus fully described myinvention, its utility and mode of operation, what I'claim and desire to secure by Letters Patent of the United States is- 1. In a multiple fuse plug, a threaded plug `series of grooves opening radially (therefrom, a fuseelement having a central portion tting in such that when the cap is positioned on the plug member, the lug of the plug member extends into one of the radial grooves of the cap and the xed contact of the plug member extends into another radial groove of the cap and into contact with the fuse member therein, a central contact member extending through the plug and cap, a nut threadable onto the central contact member to secure the cap to the plug member and electrical contact. means between the central contact member and the central portion of the fuse element.

2. In a multiple fuse plug, a threaded plug member having aA circular recess at the top, a contact" iiiedly positioned in one side of said recess and alug extending into the recess diametrically opposite the contact, a cap member havingaacirculxrfportion adapted to be positioned in the recess of the plug member, the circularportion of the cap being provided with al centralrecessl and a" series'fof grooves: opening radially therefrom, a fuse element having:` a central portion fitting; in the central'recess and havinga seriesy of fuse members formeddntegrally therewith and= extending'. radially there,

from and positionedinv theradialgrooves ofthe cap, the arrangement being such-that whenthe grooves of ther-cap-and one of. therfuse members contacts the fixed contact and meansforl secur r ing-fthe cap to the plug member'.

MAURICE LEIIF'EBRE;r 

